SH7020 Datasheet, PDF (72/509 Pages) Renesas Technology Corp – SuperH™ RISC engine

3. Clears the vector base register (VBR) to H'00000000, and sets interrupt mask bits I3–I0 in the
status register (SR) to H'F (1111).
4. Loads the values read from the exception vector table into PC and SP and starts program
execution.
Further, make sure to carry out a power-on reset when turning on the power of the system.
4.2.3 Manual Reset
When the NMI pin is high, a low input at the RES pin drives the chip into the manual reset state.
To be assured of resetting the LSI, drive the RES pin low for at least 20 t_cyc. A manual reset
initializes the internal state of the CPU and all registers of the on-chip peripheral modules except
the bus state controller, pin function controller and I/O ports. Since a manual reset does not affect
the bus state controller, the DRAM refresh control function operates even if the manual reset state
continues for a long time. When a manual reset is performed during the bus cycle, the manual
reset exception processing waits for the end of the bus cycle before beginning. The manual reset
thus cannot be used to abort the bus cycle. For the pin states during the manual reset state, see
appendix B, Pin States.
While the NMI pin remains low, if the RES pin is held low for a certain time then driven high in
the manual reset state, manual reset exception processing begins. The CPU carries out the same
operations as for a power-on reset.
4.3 Address Errors
4.3.1 Address Error Sources
Address errors occur during instruction fetches and data reading/writing as shown in table 4.5.
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